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The call into ifa_ifwithaddr() needs to be epoch protected; ortherwise

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we'll panic on an assertion.
While here, leave a comment that the ifp was never protected and stable
(as glebius pointed out) and this needs to be fixed properly.

Discovered while working on:	PR 246629
Reviewed by:	glebius
MFC after:	4 days
Sponsored by:	Rubicon Communications, LLC (d/b/a "Netgate")
This commit is contained in:
Bjoern A. Zeeb 2020-06-17 20:58:37 +00:00
parent 9a7053ce96
commit b7b3d237e7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362288
1 changed files with 6 additions and 0 deletions
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6
sys/netinet/ip_mroute.c
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@ -879,13 +879,19 @@ add_vif(struct vifctl *vifcp)
*/
ifp = NULL;
} else {
struct epoch_tracker et;
sin.sin_addr = vifcp->vifc_lcl_addr;
NET_EPOCH_ENTER(et);
ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
if (ifa == NULL) {
NET_EPOCH_EXIT(et);
VIF_UNLOCK();
return EADDRNOTAVAIL;
}
ifp = ifa->ifa_ifp;
/* XXX FIXME we need to take a ref on ifp and cleanup properly! */
NET_EPOCH_EXIT(et);
}
if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) {